Maveth - A planet introduced in Agents of SHIELD it is not clear which galaxy the planet is located. I think most likely candidates are Greater Magellanic Cloud (Home of Kree) or the Black Galaxy home to Ego the Living planet.

Edge of Universe There are few mysterious places located on the edge of the expanding Universe:

Details: Shi'ar Throne World - Chandilar and other Shi'ar PlanetsSpartoix Empire also resides within the Shi'ar galaxy. The are a political offshoot of the Shi'ar but do not appear to racially based off the Shi'ar as they appear to be human and not Avian based. The Spartoix Empire is made up of hundreds of planets while the Shi'ar empire is made up of millions of planets.

Note
a common Marvel Error - The Shi'ar galaxy is commonly said to be M-31 this is
an error by Marvel. M-31 is the Star map number for Andromeda Galaxy
(Skrulls Galaxy). They likely meant M-33 which
is the Triangulum Galaxy. I have seen one
post from some one else who thinks it is meant to be M-33 as well. At
any rate hopefully some one at Marvel will read this post and stop
printing maps showing it as M-31(Like the one above). Especially since
the Shi'ar are currently the most important alien empire in the Marvel
Universe.